Tool-holder.



J. ARMSTRONG.

TOOL HOLDER.

APPLICATION FILED JAN. 14, I916.

1214,49. Patented Feb. 6, 1917.

and the recess JAMES ARMSTRONG, OF CHICAGO, ILLINOIS, ASSIGNOR TO ARMSTRONG BROTHERS TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TOOL-HOLDER.

' Application filed January 14, 1916.

To all whom it may concern:

Be it known that I, Janus ARMSTRONG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tool-Holders, of which the following isa specification.

This invention relates to tool holders for lathes or other metal working machines.

In my co-pending application, Serial No.

72,017, filed of even date herewith, I have:

disclosed a tool holder embodying some of the features of the present invention, and broad claims to these features are contained in said other application.

The object of the present invention is to provide a better tool-clamping means than those now known and more particularly the invention refers to the means for forcing the intermediary member into clamping en gagement with the tool and to the cooperating beveled faces on the end of said member therefor respectively.

In the accompanying drawings, Figure 1 is a side elevation of a tool holder embodying the features of my invention. Fig. 2 is a longitudinal central section in the plane of line 22 of Fig. 3. Fig. 3 is a front elevation with the tool shown in section. Fig. 4 is a transverse section in the plane of line 1% of Fig. 1. Fig. 5 is a view representing the intermediary member in side elevation and in plan. Fig. 6 is a fragmental sec tional view of an alternative construction. Fig. 7 is a section on line 7-7 of Fig. 6.

The tool holder comprises a suitable body 16 having the usual inclined socket 11 to receive the tool 12. A member 13 has a large flat face adapted to bear directly against the upper side of the tool 12, said member fitting loosely in a recess 14; which merges into the tool socket 11. The member is loosely supported in the body by suitable means adapted to allow the necessary play of the member in performing its function. This means, in the form herein shown, comprises a screw 15 seated in the body and passing loosely through a transverse hole 16 through the member.

On its upper side the member 13 is provided with a beveled projection 17 The body has a transverse hole therethrough opening into the recess 14 and in this hole a bolt 18 fits. Said bolt is provided with a recess or notch 19 having an inclined cam Specification of Letters Patent.

Patented Feb. 6, 1917.

Serial No. 72,018.

face to cooperate with the cam face on the projection 17. One end of the bolt is threaded, and a nut 20 turned thereon is arranged to draw the bolt endwise so that the member 13 will be forced downwardly to clamp the tool rigidly in the holder. Preferably the nut 20 has a circular inner portion seated in a countersink in the body.

As indicated in Fig. 2, the supporting screw 15 is, in the present instance, located somewhat forward of the longitudinal center of the member 13. In the absence of the tool 12 the rear end of said member may tip down, but such tipping will be limited by the cooperating conical ends of the member 13 and its recess.

In Figs. 6 and 7 I have shown an alternative form of cam for pressing the member 13 into clamping contact with the tool. The cam member illustrated in said figures comprises cylindrical portions 21 rotatably mounted in the body of the tool holder, and an intermediate eccentric or cam portion 22 arranged to bear against a fiat or otherwise suitably shaped surface on the member 18. The cam member may be turned into and out of engagement with the member 13 by means of a wrench placed upon the polygo nal end 23 of the cam member. Endwise displacement of the cam member may be prevented in any suitable way, as by means of a screw 24, the inner end of which extends into an annular groove 25 in the cam member.

It will be seen that the member 13 receives the pressure from the bolt 19 or the cam 22 and distributes such pressure over a large area on the tool 12. Not only is a better grip thereby afforded on the tool, but breakage of the tool, which has heretofore been a more or less common occurrence, is practically eliminated.

The foregoing disclosure is not to be understood as a limitation of the invention, the scope of which is pointed out in the appended claims.

I claim as my invention:

1. A tool holder comprising a body having a tool-receiving socket and having a recess merging into said socket, a member movably fitting in said recess and having at one side a large face to bear against the tool and at its opposite side a cam face, the body having a transverse opening therethrough, a bolt passing through said opening and having a cam face to cooperate with the cam face on said member, and a nut on said bolt for drawing the latter endwise to clamp said member against the tool.

2. A tool holder comprising a body having a tool-receiving socket and having a re- I cess merging into said socket, the end Wall of said recess being inclined, a member movably fitting in said recess and having a large face arranged to bear against the tool, one end of said member also being inclined and being adapted to engage the inclined end wall of said recess in the absence of the tool to partially support said member, a screw seated in the body and arranged to loosely engage said member to support the latter, and means for clamping said member against the tool.

A tool-holder comprising a body hav-.

ing a tool-receiving socket and having a recess merging into said socket, a member movably fitting in said recess and having at one side a large face to bear against the tool, the body having a transverse opening therethrough, a bolt passing through said opening and having a cam face engaging said member, and a nut on said bolt for drawing the latter endwise to clamp said member against the tool.

In testimony whereof, I hereunto set my hand in the presence of two witnesses.

J AMES ARMSTRONG.

In the presence of- N. J. BRADDOOK, C. A. RANDALL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

